涡轮机油氧化安定性评价指标研究

Study on Evaluation Indexes of Oxidation Stability for Turbine Oil

从色度、酸值、抗乳化性、旋转氧弹值、漆膜倾向指数(MPC值)、沉淀物(油泥与正戊烷不溶物)等指标出发,以某电厂新涡轮机油及运行涡轮机油为样品,开展开口杯老化试验、红外光谱试验,研判涡轮机油抗氧化性能和氧化安定性的相关性,明确氧化安定性评价指标。研究发现:抗氧化性能各项指标与油品老化时间和油品氧化程度均呈现出一定的正相关性;旋转氧弹值和漆膜倾向指数应与《电力用油名词术语》DL/T419—2015中提及的酸值和沉淀物连同作为涡轮机油氧化安定性的主要评价指标;油品老化后产生的析出性油泥含有羰基化合物及酯基化合物,应在油品氧化初期阶段及时去除油泥等沉淀物,以避免老化产物的积累及大分子油泥的产生。

Started from the indexes such as chromaticity,acid value,emulsion resistance,rotating oxygen bomb value,paint film tendency index(MPC value),sediment(sludge and n-pentane insolubles),the new turbine oil and the running turbine oil of a power plant were taken as samples,to carry out the open cup aging test and infrared spectrum test,and thus,the correlation between the antioxidant performance and the oxidation stability of turbine oil was judged,and the evaluation indexes of oxidation stability were determined.Findings:all indexes of antioxidant performance are positively correlated with oil aging time and oil oxidation degree;rotating oxygen bomb value and paint film tendency index should be taken as the main evaluation indexes of oxidation stability of turbine oil together with the acid value and sediment mentioned in Glossary on Electric Power Oil(DL/T 419—2015);the precipitated sludge produced after oil aging contains carbonyl compounds and ester-based compounds,so the sludge and other sediments should be removed in time at the initial stage of oil oxidation to avoid the accumulation of aging products and the production of macromolecular sludge.